recepies/iptables/iptables-tcp-proxy.sh

#!/bin/sh

# http://www.debian-administration.org/articles/595

test -z "$1" -o -z "$2" -o -z "$3" -o -z "$4" && echo "$0 LOCAL_IP LOCAL_PORT REMOTE_IP REMOTE_PORT" && exit 1

IPTABLES=/sbin/iptables

echo 'echo 1 > /proc/sys/net/ipv4/ip_forward'

echo $IPTABLES -t nat -A PREROUTING --dst $1 -p tcp --dport $2 -j DNAT --to-destination $3:$4
echo $IPTABLES -t nat -A POSTROUTING --dst $3 -p tcp --dport $4 -j SNAT --to-source $1
echo $IPTABLES -t nat -A OUTPUT --dst $1 -p tcp --dport $2 -j DNAT --to-destination $3:$4
1	#!/bin/sh
2
3	# http://www.debian-administration.org/articles/595
4
5	test -z "$1" -o -z "$2" -o -z "$3" -o -z "$4" && echo "$0 LOCAL_IP LOCAL_PORT REMOTE_IP REMOTE_PORT" && exit 1
6
7	IPTABLES=/sbin/iptables
8
9	echo 'echo 1 > /proc/sys/net/ipv4/ip_forward'
10
11	echo $IPTABLES -t nat -A PREROUTING --dst $1 -p tcp --dport $2 -j DNAT --to-destination $3:$4
12	echo $IPTABLES -t nat -A POSTROUTING --dst $3 -p tcp --dport $4 -j SNAT --to-source $1
13	echo $IPTABLES -t nat -A OUTPUT --dst $1 -p tcp --dport $2 -j DNAT --to-destination $3:$4